Effect of inner lens is to change transmit direction of light from chip of light emitting diode (LED). Being gotten together in very small angle along direction perpendicular to central axis of chip of LED, most of light transmits around from side face. The inner lens and chip of LED are sealed together. The sealed LED module includes base; chip of LED installed on the base; bottom part of the inner lens is connected to the base. Chip of LED is located on central axis of the inner lens. Through refraction surface and total reflection surface of inner lens, side face of light source of LED transmits more beams collected by inner lens at direction of side face of LED. The invention enhances luminous efficiency of side face of LED.本发明提供一种侧面发射发光二极管光源的内透镜。其作用是改变发光二极管芯片的光的发射方向，将大部分光从侧面，沿垂直于发光二极管芯片中心轴线的方向聚集在很小的角度内向周围发射。内透镜与所述发光二极管芯片一起封装，封装后的二极管模块包括底座；发光二极管芯片，其安装于底座上；内透镜，其底部与底座相连，且发光二极管芯片位于内透镜的中心轴上。通过内透镜的折射表面和全反射表面，该发光二极管芯片光源的侧面发射内透镜在LED的侧面方向集中了更多的光束，增强了LED的侧面发光效率。

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